Alright not singling this person out but theres at least 3 threads here on the front page from "concerned customers" and it leads me to ask....
Just how much money have you guys spent on the game? Cause last I checked, 50 bucks gives you lifetime access to the game. And I am sure many of you waited for a sale and a few even got it for free.
So I am a bit at a loss at just how much folks around here are expecting for their one time purchase. Ever played a subscription based game? Or a mobile "free to play" with their insane monetization models, raking in hundreds, if not thousands PER MONTH from individual players in order for them to remain competetive? Those games milk insane amounts of money out of their players not only for profit, but to keep the studio running in order to continue generating content.
If you think that the 50 bucks you shelled out 3 years ago is keeping the developers fed and motivated, I think you might need some basic lessons in economics.
In order for this dev team to start churning out progress on the scale which is being demanded they would have to change their payment model into something more sustainable.
Until they do, be happy with your purchase and consider it a gift when something is added.